Valutazione della salute fetale

REFERENCES
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7. Pandya P P, Johnson S, Malligianis P, and Nicolaides K H. First Trimester fetal nuchal translucency and screening for chromosomal abnormalities. Ultrasound and early pregnancy Chapter 7
8. Snijders R J M, Holzgreve W, Cuckle H and Nicolaides K H. Maternal age-specific risks for trisomies at 9-14 weeks gestation. Prenatal Diagnosis (1994) 13:543-552 For the purposes of the calculator I have assumed a uniform loss of pregnancies with trisomy 13 and 18 as a result to miscarriage between 9 and 14 weeks and 15 and 20 weeks.
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18. Nicholaides K H, Snijders R J M, and Cuckle H S Correct estimation of parameters for ultrasound nuchal translucency screening. Prenatal Diagnosis 1998 18;511-523
19. Benacerraf BR, Gelman R, Frigoletto Jr FD Sonographic identification of second-trimester fetuses with Down's syndrome. 1987;